The strange white cloud band across the sky of American city

The appearance of the cloud band has a special shape in Indianapolis that many people witness astonished.

Rattan clouds across the sky of Indianapolis.(Photo: Fox59).

A particularly large cloud of clouds appeared in the sky in Indianapolis, Indiana, USA, creating a spectacular sight, Fox59 reported on January 22. Many witnesses quickly take pictures and share on social networks.

This type of cloud is called shelf cloud , often forming on the outer edge of a storm , meteorologist Jim O'Brien said. The striking long line seen in the cloud is the boundary between the upward air flow and the downward moving air flow of the storm.

Rattan together with two types of. Rattan clouds form at low and horizontal levels, similar to roll clouds. However, rattan rolls are usually tubular.